2004 GMC Canyon Owner's Manual - Page 144

#(Air Conditioning): Your vehicle may have air conditioning. Press this button to turn the air-conditioning system on or off. An indicator light on the button will come on to let you know the air conditioning is activated. When the system is on, this setting cools and dehumidifies the air entering your vehicle. The air conditioning will not function if the fan is turned off. You may notice a slight change in engine performance when the air conditioning compressor shuts off and turns on again. This is normal. The system is designed to make adjustments to help with fuel economy while still maintaining the selected temperature. The air conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal. Defogging and Defrosting Fog on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to clear fog or frost from your windshield and side windows. Use the defog mode to clear the windows of fog or moisture and warm the passengers. Use the defrost mode to remove fog or frost from the windshield more quickly. For best results, clear all snow and ice from the windshield before defrosting. Turn the mode knob on the climate control panel clockwise to select the defog or defrost modes. /(Floor/Defog): This mode directs the air to the windshield, the side window outlets, and to the floor outlets. When you select this mode, the system runs the air conditioning compressor unless the outside temperature is near freezing or below. Recirculation is not available in this mode. 0 (Defrost): This mode directs most of the air to the windshield, and the side window outlets. When you select this mode, the system runs the air conditioning compressor unless the outside temperature is near, or below freezing. Recirculation is not available in this mode. Do not drive the vehicle until all the windows are clear. 3-20